Hi!
Im about to take the plunge and upgrade to High Sierra. I'm running an 09' Mac Pro 4,1 that has been flashed to 5,1 and is running Yosemite 10.10.5. I have made a bootable clone drive of this Yosemite system, because there are some apps I may need to use that are not compatible with High Sierra. So I will have my new / High Sierra system on a new drive, and a backup boot drive / Yosemite system.
My question is - will Yosemite still work with the Firmware update that is required for High Sierra? Or will I have to "downgrade" firmware (if one can do such a thing) in order to use Yosemite again?
Any help would be much appreciated! Let me know if I need to post additional info about my rig. (Forgive me if I posted this in the wrong spot - I was torn between this and the Mac Pro forum. . . )
Chase
Im about to take the plunge and upgrade to High Sierra. I'm running an 09' Mac Pro 4,1 that has been flashed to 5,1 and is running Yosemite 10.10.5. I have made a bootable clone drive of this Yosemite system, because there are some apps I may need to use that are not compatible with High Sierra. So I will have my new / High Sierra system on a new drive, and a backup boot drive / Yosemite system.
My question is - will Yosemite still work with the Firmware update that is required for High Sierra? Or will I have to "downgrade" firmware (if one can do such a thing) in order to use Yosemite again?
Any help would be much appreciated! Let me know if I need to post additional info about my rig. (Forgive me if I posted this in the wrong spot - I was torn between this and the Mac Pro forum. . . )
Chase